visualFields (version 0.4.3)

vfsegmentcoord: calculate line segments to plot in vfplot representing the overall orientation of the retinal nerve fibre layer bundles according to Jansonious map [1]

Description

This function geneartes coordinates for the line segments to be plotted

Usage

vfsegmentcoord( lineMap, length = 2.5 )

Arguments

lineMap

patternMap having x,y and slope values

length

length of the line segment in inches. Default is 3.75

Details

This function geneartes coordinates for the line segments to be plotted. Based on the location (x,y) and slope, this function claculates the coordinate set (x1,y1),(x2,y2) which is used to plot the line segments

References

[1] N. M. Jansonius, J. Nevalainen, B. Selig, L. M. Zangwill, P. A. Sample, W. M. Budde, J. B. Jonas, W. A. Lagreze, P. J. Airaksinen, R. Vonthein, L. A. Levin, J. Paetzold, and U. Schiefer. A mathematical description of nerve fiber bundle trajectories and their variability in the human retina. Vision Research, 49, 2009.

Examples

# NOT RUN {
# DO NOT EXECUTE
#vfsegmentcoord( lineMap,length )
# }